Optical filter and display apparatus with the same

Abstract

An optical filter applied to a display apparatus, disposes on a substrate with transparency and has a maximum absorption wavelength λ in a wavelength range of 575±20 nm in connection with a wavelength range from 450 to 650 nm. The optical filter satisfies a relationship, 0.65≦ T 1 (λ)/ T 2 (λ)≦0.90 where T 1 (λ) is a transmittance at a central part of the substrate at the maximum absorption wavelength λ, and T 2 (λ) is a transmittance at a peripheral part of the substrate at the maximum absorption wavelength λ. The optical filter also satisfies a relationship, 0.90≦( T 1 (λ 1 )/ T 2 (λ 1 ))/( T 1 (λ)/ T 2 (λ))≦1.05 with respect to transmittances wherein λ 1 is each wavelength 450 nm, 530 nm and 630 nm, and λ is the maximum absorption wavelength.

1. An optical filter disposed on a substrate with transparency and having a maximum absorption wavelength (λ) in a wavelength range of 575±20 nm in connection with a wavelength range from 450 to 650 nm,
 wherein the optical filter is configured to satisfy a relationship,
   0.65 ≦T 1(λ)/ T 2(λ)≦0.90 
 
 
     where T 1  (λ) is a transmittance at a central part of the substrate at said maximum absorption wavelength λ, and T 2  (λ) is a transmittance at a peripheral part of the substrate at said maximum absorption wavelength λ, and
 the optical filter is configured to satisfy a relationship,
   0.90≦( T 1(λ1)/ T 2(λ1))/( T 1(λ)/ T 2(λ))≦1.05 
 
 
     with respect to transmittances at wavelengths λ 1  and λ, wherein λ 1  is each wavelength of 450 nm, 530 nm and 630 nm and λ is said maximum absorption wavelength. 
   
   
     2. The optical filter according to  claim 1 , wherein the optical filter includes a support member formed of a glass material or a high-polymer material, which has transparency. 
   
   
     3. The optical filter according to  claim 1 , wherein the optical filter has a stacked structure on the substrate, the stacked structure including a light-selective absorption filter layer having a maximum absorptance at the specified wavelength, and a neutral filter layer having a substantially constant transmittance in the wavelength range of 450-650 nm. 
   
   
     4. The optical filter according to  claim 3 , wherein the neutral filter layer has a less film thickness at the peripheral part of the substrate than at the central part of the substrate. 
   
   
     5. A display apparatus with an optical filter disposed on a display screen that displays an image,
 wherein the optical filter has a maximum absorption wavelength λ in a wavelength range of 575±20 nm in connection with a wavelength range from 450 to 650 nm, 
 the optical filter is configured to satisfy a relationship,
   0.65 ≦T 1(λ)/ T 2(λ)≦0.90 
 
 
     where T 1  (λ) is a transmittance at a central part of the display screen at the maximum absorption wavelength λ, and T 2  (λ) is a transmittance at a peripheral part of the display screen at the maximum absorption wavelength λ, and
 the optical filter is configured to satisfy a relationship,
   0.90≦( T 1(λ1)/ T 2(λ1))/( T 1(λ)/ T 2(λ))≦1.05 
 
 
     with respect to transmittances at wavelengths λ 1  and λ, wherein λ 1  is each wavelength of 450 nm, 530 nm and 630 nm and λ is said maximum absorption wavelength. 
   
   
     6. The display apparatus according to  claim 5 , wherein the optical filter is disposed on an outer surface of a face panel that is formed of glass, the face panel having a phosphor screen on an inner surface thereof. 
   
   
     7. The display apparatus according to  claim 6 , wherein the outer surface of the face panel is substantially flat.